你可以打开窗户吗？

Nǐ kěyǐ dǎkāi chuānghu ma?

Can you open the window?

他打开电脑看电影。

Tā dǎkāi diànnǎo kàn diànyǐng.

He turns on the computer to watch a movie.

请打开窗户，让房间凉快一点。

Qǐng dǎkāi chuānghu, ràng fángjiān liángkuai yìdiǎn.

Please open the window to make the room a bit cooler.